人体维生素B1严重缺乏时可引发()
A.佝偻病
B.贫血
C.夜盲症
D.脚气病
E.坏血病
参考答案:D
The wise parents can tell whether their children are telling the truth____ they listen to their excuses to wrong deeds.
A.the first time
B.for the first time
C.every time
D.for every time
I can't help _____ the cleaning _____ I'm busy mixing up some dumplings now.[ ]
A. doing, because
B. to do, now that
C. doing, since
D. to do, therefore